Controlled synthesis of silver-based ternary quantum dots with outstanding luminescence

Gracia It Mwad Mbaz, Sundararajan Parani, Oluwatobi Samuel Oluwafemi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Quantum dots (QDs) have attracted much attention over the past decades due to their outstanding properties. However, obtaining QDs with excellent photoluminescence and quantum yields (QYs) from their aqueous synthesis is still a big concern. We herein present a green and facile synthesis of AgInS (AIS) QDs and AgInS-ZnS (AIS-ZnS) core-shell QDs using a combination of two capping agents (glutathione and sodium citrate). The temporal evolution of the optical properties is investigated by varying the reaction time and pH of the solution. The results show that the fluorescence intensity of the QDs increases as the reaction time increase, while the emission position blue-shift as the pH of the solution increase. An outstanding photoluminescence quantum yield (PLQY) of 90% is obtained at optimized synthetic conditions. The Fourier transform Infrared studies confirm efficient passivation of the QDs by the capping agents. The XRD analysis reveals that all the materials crystallize in the tetragonal crystalline phase, while the TEM micrographs of AIS-ZnS QDs reveal a spherical shape. The EDS analysis confirms the presence of Silver, Indium, Sulphide, and Zinc elements. The reported synthetic route is facile and eco-friendly.

Original languageEnglish
Pages (from-to)1769-1777
Number of pages9
JournalJournal of Fluorescence
Issue number5
Publication statusPublished - Sept 2022


  • AgInS
  • AgInS-ZnS
  • Core-shell
  • Quantum dots

ASJC Scopus subject areas

  • Biochemistry
  • Spectroscopy
  • Clinical Biochemistry


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